Sonya Kiryuu

桐生 ソーニャ

Sōnya is Umi's classmate and her best friend. Her mother is Italian and her father Japanese. When she was little her father died in an accident and her mother went back to Italy, leaving Sōnya in Japan. Sōnya was adopted by a Japanese woman named Mai Kiryū. Sōnya is a Christian and a novice nun. (Source : Wikipedia)